-2r + 3 greater then or equal to 19

The graph of a curve that passes the vertical line test is a:

How many significant figures are there in the number 10.76?

How do you find p(a and b) if a and b are independent events for two or more actions, such as tossing a coin twice and finding p(heads and heads)? 2. how do you find p(a or b) if a and b are independent events for one action, such as spinning a four-color spinner once and finding p(red or blue)?